Fiddle with the float values to make the door open. Look at the door in your level editor. The blue line is the Z axis, the red line is the X axis. You'll probably not need any Y value (green line) unless you have a door leading through the roof or something weird like that.

asName - the object to push
afX - direction along the X-axis
afY - direction along the Y-axis
afZ - direction along the Z-axis
asCoordSystem - determines which coordinate system is used, usually “world”

You have to use quite big numbers for doors, I think, but if your float isn't that big, it should open slowly